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325 HP enough for higher elevation?

So I am looking to buy my first inboard and am looking for something like a 07-09 XLV or possibly a LSV. I also love the Supra 21v or 22ssv. What I am finding is that most of the boats I find for sale have the 325 HP engine. I live in Salt Lake City, Utah and most of the lakes are about 5,000 ft. in elevation. I talked to the dealer here in town and he said that he would definitely look for a 340 HP engine due to the altitude here. Maybe the 325 would be ok for a little smaller boat like the LSV or the 21V but he has me worried about not having enough HP, especially for a bigger boat with 8-10 people onboard. I would love any thoughts you have. Thanks in advance.

coming from Boise, I found prop selection to be a larger piece than the bigger engine.
granted my launch20 had the ext340,but I could not get on plane(above 17mph) with the 13x17 prop, 2400lbs of water and 5 peeps. I swapped out to the 14x14(or some variant acme makes) and holeshot and onplane was amazing. lost 3 or so mph on the top end, but who cares. it's about pulling boarders, not top speed imo.

my cousin just bought a used tige 2300v- a 23.5ft battleship. it had no issues surfing with the mercruiser 325. I would not be afraid to buy an xlv/lsv with the 325 and especially if the right deal came along, but if given a choice and you can wait, more is always better.

Hey, I'm in Denver. i have an LSV with 325, i had the SC wakeboard prop from OJ, it pulled well enough, we could load up the boat with people and ballast, still pulled up fine. changed props to an acme, but dont remember which, it pulls better, lost a bit on the top, would prefer to change props when going to lower elevation like powell for fuel economy. ive been on many lake in salt lake area, utah lake, pineview, rockpork echo, bear lake, jordanelle. never a concern. i don't think the XLV is too much heavier than the LSV. i would not worry about the 325.